peephole

名词 peephole:

1. a hole (in a door or an oven etc) through which you can peep
   同义词：spyhole, eyehole

peep.hole

n.（名词）
A small hole or crevice through which one may peep.Also called eyehole
窥孔：一个人们可以用来偷窥的小孔或裂缝也作 eyehole